If you have an issue that seems to be a phone bug, and have already gone through the process of resetting the phone, you can use these steps to return the phone to factory settings:
1. Press MUTE then 772667# . The phone will ask if you would like to go into Factory Test Mode, press # for Yes.
2. When prompted for the password, press 1234#
3. The screen will be blank, now enter 25327# to clear the phone
4. After clearing the data, the phone will reset back into the Factory Test Mode again.
5. Power cycle the phone by unplugging it and plugging it back in. It will start up normally and re-pull all config files from the FTP server.